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Reference.org
Power system simulator for engineering
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<p>Power System Simulator for Engineering (PSS®E—often written as PSS/E) is a software tool used by power system engineers to simulate <a href="/facts/Electrical_power_transmission/I9w3lRmM">electrical power transmission</a> networks in steady-state conditions as well as over timescales of a few seconds to tens of seconds. </p><p>Since its introduction in 1976, it has evolved from a simple <a href="/facts/Command-line_interface/R9JpGmXQ">command-line interface</a>, to an integrated, interactive program for simulating, analyzing, and optimizing power system performance, and it can provide probabilistic and dynamic modeling features. </p>